If it's any consolation the rap route involves any amount of prickle bushes as well. Plus getting the ropes caught on flakes and knobs. It's the only abseil that has come close to competing with the comet ramp approach to Ozy for sheer unpleasantness, in my experience. I meant to start an "Repellant Rappels and Abhorrent Abseils " thread, but never got around to it.
For future reference though, from the top of Spiegle's you scramble down a narrow rock gully/chute to the right (as you face the cliff) and then pick your way carefully downhill for ~5-10 meters to find the first rap station.